/Engine/Plugins/Runtime/AudioSynesthesia/Source/AudioSynesthesia/Classes/LoudnessNRT.h
Enumeration of available equal loudness curves. Loudness curves based on IEC 61672-1:2013 Electroacoustics - Sound level meters - Part 1: Specifications.
enum ELoudnessNRTCurveTypeEnum { A, B, C, D, None, }